@article{Baizán2003,
author = {Baizán, P. and Aassve, A. and Billari, F.C.},
title= {Cohabitation, marriage, and first birth: The interrelationship of family formation events in Spain},
year = {2003},
journal = {European Journal of Population },
volume = {19},
number = {2},
pages = {47--169},
}